Background:

Applications of luminescent quantum dots require the materials to be
stable under a wide range of temperatures, photon fluxes and chemicfial
environments. The researchers from St Lois demonstrate that Al2O3
shells synthesized by atomic layer deposition on films of CdTe quantum
dots are effective to prevent chemical degradation for up to 17 hours
under continuous illumination at 90 °C in ambient air.

ALD was carried out in a custom hot wall reactor and more information can be found in the free to download supplementary information (here).